This has been asked before but the answer is always to use ghost script. This isn't available on hosts using cPanel. Is it possible to do without Ghostscript extension installed?
Step 1: Open the PHP coding environment and start by creating imagic object using the code. $imagick = new Imagick(); Step 2: Now read the image from the target PDF file using the code: $imagick->readImage('myfile.
Just a quick suggestion for those considering using an external service to achieve this: now, some APIs allow to upload documents and retrieve their related info, thumbnail, etc.
For instance see Cloudinary (which offers a free plan) : https://cloudinary.com/blog/uploading_converting_and_generating_thumbnails_for_pdf_documents
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